The folks over at DZone have added to their RefCardz selection with a PHP version quick reference card.

PHP is the world's most popular server-side Web scripting language. This reference card was created to help you quickly navigate some of PHP's most commonplace features, including objectoriented programming, array and string manipulation, regular expressions, and MySQL integration.

The card (created by Jason Gilmore) is available for free download (PDF) from the DZone website.